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package pkg1ifxArchivos;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

/**
 *
 * @author strailaparicio
 */
public class cifxCifrar {
    private Cipher ecipher;
    private Cipher dcipher;
    private cifxLogs olog = new cifxLogs("ifxlog.log");
    private byte[] salt = {
        (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
        (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
    };
    // 
    private int iterationCount = 19;

    public cifxCifrar(String palabradecrifrado) {
        try {
            // Create the key
            KeySpec keySpec = new PBEKeySpec(palabradecrifrado.toCharArray(), salt, iterationCount);
            SecretKey key = SecretKeyFactory.getInstance(
                "PBEWithMD5AndDES").generateSecret(keySpec);
            ecipher = Cipher.getInstance(key.getAlgorithm());
            dcipher = Cipher.getInstance(key.getAlgorithm());

            // Prepare the parameter to the ciphers
            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

            // Create the ciphers
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        } catch (java.security.InvalidAlgorithmParameterException e) {
        } catch (java.security.spec.InvalidKeySpecException e) {
        } catch (javax.crypto.NoSuchPaddingException e) {
        } catch (java.security.NoSuchAlgorithmException e) {
        } catch (java.security.InvalidKeyException e) {
        }
    }

    public cifxCifrar(SecretKey key) {
        // Create an 8-byte initialization vector
        byte[] iv = new byte[]{
            (byte)0x8E, 0x12, 0x39, (byte)0x9C,
            0x07, 0x72, 0x6F, 0x5A
        };
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
        try {
            ecipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            dcipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

            // CBC requires an initialization vector
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        } catch (java.security.InvalidAlgorithmParameterException e) {
        } catch (javax.crypto.NoSuchPaddingException e) {
        } catch (java.security.NoSuchAlgorithmException e) {
        } catch (java.security.InvalidKeyException e) {
        }
    }

    public void setLog(cifxLogs log)
    {
        olog=log;
    }
    // Buffer used to transport the bytes from one stream to another
    byte[] buf = new byte[1024];
    /**
     * 
     * @param origen
     * @param destino
     * @throws IOException 
     */
    public void cifrarArchivo(String origen, String destino) 
    {
        OutputStream out = null;
        InputStream in = null;
        try {
            
            File forigen = new File(origen);
            if(forigen.exists())
            {
                File fstream = new File(destino);
                out = new FileOutputStream(fstream);//Graba todo 
                in = new FileInputStream(forigen);
                
                cifrarArchivo(in,out);
                out.close();
                in.close();
            }

            
            
            
        } catch (FileNotFoundException ex) {
            olog.outMensaje("cifxConfig.GuardarArchivo: ERROR FileNotFoundException: "+ex.toString());
        } catch (IOException ex) {
            olog.outMensaje("cifxConfig.GuardarArchivo: ERROR IOException: "+ex.toString());
        }
    }
    /**
     * 
     * @param origen
     * @param destino 
     */
    public void descifrarArchivo(String origen, String destino)
    {
        OutputStream out = null;
        InputStream in = null;
        try {
            
            File forigen = new File(origen);
            if(forigen.exists())
            {
                File fstream = new File(destino);
                out = new FileOutputStream(fstream);//Graba todo 
                in = new FileInputStream(forigen);
                
                descifrarArchivo(in,out);
                out.close();
                in.close();
            }

            
            
            
        } catch (FileNotFoundException ex) {
            olog.outMensaje("cifxConfig.GuardarArchivo: ERROR FileNotFoundException: "+ex.toString());
        } catch (IOException ex) {
            olog.outMensaje("cifxConfig.GuardarArchivo: ERROR IOException: "+ex.toString());
        }        
    }
    /**
     * 
     * @param in
     * @param out 
     */
    public void cifrarArchivo(InputStream in, OutputStream out) {
        try {
            // Bytes written to out will be encrypted
            out = new CipherOutputStream(out, ecipher);

            // Read in the cleartext bytes and write to out to encrypt
            int numRead = 0;
            while ((numRead = in.read(buf)) >= 0) {
                out.write(buf, 0, numRead);
            }
            out.close();
        } catch (java.io.IOException e) {
        }
    }
    /**
     * 
     * @param in
     * @param out 
     */
    public void descifrarArchivo(InputStream in, OutputStream out) {
        try {
            // Bytes read from in will be decrypted
            in = new CipherInputStream(in, dcipher);

            // Read in the decrypted bytes and write the cleartext to out
            int numRead = 0;
            while ((numRead = in.read(buf)) >= 0) {
                out.write(buf, 0, numRead);
            }
            out.close();
        } catch (java.io.IOException e) {
        }
    }  
    
    public String cifrarPalabra(String str) throws IllegalBlockSizeException {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");

            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);

            // Encode bytes to base64 to get a string
            return new sun.misc.BASE64Encoder().encode(enc);
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;
    }

    public String descifrarPalabra(String str) {
        try {
            // Decode base64 to get bytes
            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);

            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);

            // Decode using utf-8
            return new String(utf8, "UTF8");
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;
    }
}
